• This is the 95th meeting of these clubs. Chelsea have won 43 of the previous 94, Birmingham 25, with 26 drawn.

• Chelsea have lost only one of the last 20 league and cup matches against Birmingham, winning 13.

• But in the FA Cup, Birmingham have had the better of the exchanges, progressing in five of their eight previous ties. They triumphed 3-0 in a quarter-final replay on their way to the final in 1931, while Chelsea’s 3-0 home victory in January 1970 was the start of the route to their first FA Cup crown.

• The winners of this replay will be home to Leicester in the quarter-finals on Sunday, 18 March (14:05 kick off).